In this paper, a design method to reduce fabrication errors in reflector shape of a test lamp for a flame detector is carried out. Although the test lamp should be operated in parallel with a high-intensity light, it is difficult to fix the small reflector that controls the central light during fabrication. To solve these problems, a small spherical reflector is designed to minimize the performance degradation for a light loss factor of less than 5%, even during tilt and decenter, and a spherical shape is proposed for a small reflector with little effect on the error when designing the optical system.

B. H. Lim, "A study on the improvement of the characteristic of ultraviolet infrared flame detector for fire detection," Dept. of Control and Instrumentation Eng., Graduate School of Chosun University (2006), p. 1.